Portable fuel cartridge



FIG. 1 is a top plan view of a portable fuel cartridge showing our new design;

FIG. 2 is a front plan view thereof, the undisclosed opposite sides being identical;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a perspective view thereof, shown without the cap for clarity of illustration; and,

FIG. 5 is a top plan view of FIG. 4. 

The ornamental design for a portable fuel cartridge, as shown and described. 